<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        /* 先请求A 再请求B 再请求C 练习*/
        function getUser(){
            return new Promise((resolve,reject)=>{
                console.log("A数据开始请求...");
                try{
                    //throw new Error("A错误")
                    setTimeout(()=>{
                        console.log("A数据请求成功");
                        const user={
                            username:"laoliu"
                        }
                        resolve(user)
                    },2000)
                }catch(e){
                    reject(e.message)
                }
            });
        }
        function getSex(user){
            return new Promise((resolve,reject)=>{
                console.log("B数据开始请求...");
                try{
                    //throw new Error("B错误")
                    setTimeout(()=>{
                        console.log("B数据请求成功");
                        const sex={
                            sex:"男"
                        }
                        resolve({
                            ...user,
                            ...sex
                        })
                    },2000)
                }catch(e){
                    reject(e.message)
                }
            });
        }
        function getAge(sex){
            return new Promise((resolve,reject)=>{
                console.log("C数据开始请求....");
                try{
                    //throw new Error("C错误")
                    setTimeout(()=>{
                        console.log("c数据请求成功");
                        const age={
                            age:18
                        }
                        resolve({
                            ...sex,
                            ...age
                        })
                    },2000)
                } catch(e){
                    reject(e.message)
                }
            });
        }
        async function getData() {
            const user=await getUser();
            const sex=await  getSex(user);
            const age=await  getAge(sex);
            //最后异步的操作 我们可以不用await 也会最后执行
            console.log("完整的数据是",age);
        }
        getData()
    </script>
</body>
</html>